It won’t change.
The ritual of the great dwarf affects all dwarves.
From all we kno about the ritual, even if you got dwarves from a fractal of the mists, upon stepping on Tyria, sooner or later they will undergo the ritual like all dwarves before them. Because they are no longer “The Dwarves”, they are “The Great Dwarf”. Their only purpose now is fighting destroyers.
The main things the lore of a culture needs to allow are:
- Variety in body colors and shapes. So they won’t all look the same. Kodan, for example, are out, because all kodan are white polar bears.
- A main city hub for them. So they must be civilized and organized enough to accomplish that. That leaves out all the tribal and less organized races like hylek, jotun, grawl, quaggan…
- A broad variety of personalities so people can have choices in personal story.
- A great variety in occupations in their culture, so you can find all the profession and crafting disciplines among them.
Dwarves do not qualify in any of them.
- They may have variety in shapes, since they have humanoid faces, but they are all turned into stone, clothes and all.
- They may be organized with their shared will of the Great Dwarf, but they do not gather in a city hub to prosper. They are scattered fighting the destroyers where they are.
- They are almost mindlessly set into fighting destroyers. Some retain more or less of their original personality, but in general they are all destroyer-fighting machines.
- All they think about is their battle. No time to craft and bask in creativity. No artists or creative engineers either. Just combat. A dwarf would never, ever go to a festival activity unless by doing so they fought destroyers. Even Ogden, left behind to tell the tale, is doing so only to help fight the destroyers, as knowledge is power.
The old dwarves are gone, and the coffin is well nailed.
You can’t bring them back without making up random nonsense and greatly altering the established lore.
Why would they spend the effort of making sure they are not viable as a playable race to bring them back on a whim?
1. Variety: Ogden is brownish and artwork has shown a jade-like dwarf. This means that color of the dwarves can be changed (akin to sylvari). A dwarf’s hairstyle can also be changed as well, when making a character in any mmo, you choose what ever properties you want. You can be playing a dwarf that happened to turn into stone looking like how you envisioned it, like playing as a human or charr. So dwarves can be customized.
2. Main city/Hub: How is it known if the dwarves do not have a main city? It certainly would not be Thunderhead Keep, but what is preventing them with having one underground? When you ventured in the depths, there are indeed structures underground when the dwarves were flesh. Those could be used as cities. What is preventing the dwarves to use the Asura city, because they surely must have had one back when they lived underground. The dwarves sole purpose now is to fight Primordus, and they are still smart enough to enlist the aid of outsiders, why would they not gather up and use numbers to their advantage?
3. Ogden is the only dwarf encountered so you do not really truly know if their personality is really warped. He is still very much the same as before he underwent the transformation. Yes, they all want to kill Primordus, but how is this much different from the Norns and their lust for glory? Killing primordus is just a lust for vengeance which fuels the dwarves. Each dwarf can interpret fighting the destroyers differently aswell.
4. Variety of occupations: ALL dwarves underwent the ritual, crafters and warriors alike. And if the dwarves are so adamant in fighting the destroyer, they WILL need weapons. If you need weapons, and never encounter any other advanced civilization, what do you do? You MAKE weapons. Same goes for armor, magical jewels, etc.
The dwarves were never stated to be unable to reproduce as well. They are living stone which can imply the ability to heal from wounds, and not shatter from blows. The sylvari are plants, essentially with wood as their skin. That is not very different from having a form of organic stone as a skin, so what is stopping them from still being around? Stone can be “fixed” given the right circumstances (heat), and the dwarves are fully capable of that (http://wiki.guildwars.com/wiki/Sorrow%27s_Flame). Aging was never mentioned in lore, and it is unknown if living stone erodes like regular stone.
